Always enjoyed Blow Out, an echo of the French film Blow Up, but much more immediate, not very Artsy.
A fine, simple Thriller that pre-saged Horror films that followed in it's wake. Suspense !
Also, I seem to remember that it was based on a true story and on that note, I highly recommend Kill the Messenger (2014), definitely a true story and it can't get much more conspiratorial than this one.
The real Adolf Eichmann was reputedly like the stereotypical, mild-mannered CPA, except that in his case he not only didn't care whether he was tallying a store's inventory or dead Jews, he didn't even perceive a difference. That description is suspect, since history is written by the winners, but to the extent it's accurate Tucci's performance was spot on.
I liked but wasn't crazy about Branagh's performance. First, the real Reinhard Heydrich was reputedly more personally creepy than Branagh made him out to be. Second, Branagh has an irritating habit in his acting. Remember his bit about "dead men don't hump, dead women don't get pregnant," et cetera? Sometimes it seems to me that he's simply showing off how fast he can speak while clearly enunciating. I've seen him do it in other roles too.
As you said, all the performances were good. If I had to single out my favorites they'd be Colin Firth, who played Stuckart, the man who wrote the Nuremberg Laws, and David Threlfall, who played Kritzinger, the man who found out his Fuehrer had lied to him.
Those two were just great. So many good performances, like 12 Angry Men, a small cast thrown together in close quarters and everyone is just great. Love the bombastic Ian McNeice, whom I only knew from Rome.
Good movie. Did you watch Downton Abbey? Brendan Coyle was also in that. Conspiracy was the first thing I had seen him in. For the full first season of Downton Abbey I kept thinking of his John Bates character as the Crawleys' Nazi valet.